Code in clang's lexer:
Char = getCharAndSize(CurPtr, SizeTmp);
if (Char == '=') {
Kind = tok::percentequal;
CurPtr = ConsumeChar(CurPtr, SizeTmp, Result);
} else if (LangOpts.Digraphs && Char == '>') {
Kind = tok::r_brace; // '%>' -> '}'
CurPtr = ConsumeChar(CurPtr, SizeTmp, Result);
} else if (LangOpts.Digraphs && Char == ':') {
CurPtr = ConsumeChar(CurPtr, SizeTmp, Result);
Char = getCharAndSize(CurPtr, SizeTmp);
if (Char == '%' && getCharAndSize(CurPtr+SizeTmp, SizeTmp2) == ':') {
Kind = tok::hashhash; // '%:%:' -> '##'
CurPtr = ConsumeChar(ConsumeChar(CurPtr, SizeTmp, Result),
SizeTmp2, Result);
} else { // '%:' -> '#'
// We parsed a # character. If this occurs at the start of the line,
// it's actually the start of a preprocessing directive. Callback to
// the preprocessor to handle it.
// TODO: -fpreprocessed mode??
if (TokAtPhysicalStartOfLine && !LexingRawMode && !Is_PragmaLexer)
goto HandleDirective;
Kind = tok::hash;
}
} else {
Kind = tok::percent;
}
Indentation is not a sufficient way to make C's if-statements readable.
Makes you want to do something like this:
if-stmt
: "if" expr "->" stmt
| "if" expr "{" stmt_list "}" else-clause
;
else-clause
: <empty>
: "else" "{" smt_list "}"
: "elseif" expr "{" smt_list "}" else-clause
;